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720=587+x
We move all terms to the left:
720-(587+x)=0
We add all the numbers together, and all the variables
-(x+587)+720=0
We get rid of parentheses
-x-587+720=0
We add all the numbers together, and all the variables
-1x+133=0
We move all terms containing x to the left, all other terms to the right
-x=-133
x=-133/-1
x=+133
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